Metal hoop



A. M. WALSTROM Sept. 3, 1929. METAL HOOP I Re. 17,423

Original Filed Jurie 1925 2 Sheets-Sheet 1 ROM I Re. 17,423

WALST Sept. 3, 1929.

Reissued Sept. 3, 1929.

UNITED STATES PATENTMOFFICE.

AXEL M. WAnsTROM, or MINNEAPOLIS, M NNESOTA, nssIoNon TO-EIIGIN BUTTER TUB COMPANY, or ELGIN, ILL NOIS, A CORPORATION OF ILLINOIS.

METAL HOOP.

Original m. 1,605,628, dated November 2, 1926, Serial no. 33,981, as June 11, 1925. Application In reissue filed August 22, 1928. Seria1,No. 301,373. I

My invention relates to metal hoops as used on coopered packages such as pails, tubs, kegs and barrels. These coopered packages are made up of tapered wooclenstaves placed edge to edge in a cylindrical cone-shaped form, on which the hoops are forcedwith considerable pressure in order to draw said staves together to makeja tight package. When these packages are stored in a dry place, they'frequent- 1y shrink to such extent that the hoops .thereonloosen, drop off andallow the staves to fall apart. It also happens when a package has shrunk'considerably thatv the user will drive the hoops beyond their original po sitionon the package, and-in such case, when the. package is filled with a moist commodity,

the staves will swell and exert an undue pressure that strains the hoops beyond the breaking point. 1 I

The object of my invention is to provide a metal hoop which will grip the surfaceof the package, even tho said package has shrunk considerably by drying.

Another object is ahoop having v a better appearance and which may be formed by a simple machine, as comparedto the beaded hoop now in general use and which is hereinafter referred to.

A further object is a hoop in which the bead, 0 provided On one edge thereof, is openso as to receive the over-lapping end to form an im' proved joint, as will hereinafter appear.

Myjin vention consists Of'a flat metal strip corrugatedlongitudinally and rolled into a hoop. with overlapping ends secured together. This hoop is flared to fit'the tapered package; and the forward edge is turned slightly outwardly to facilitate the driving thereof, and the rear edge of said hoop is pro- 40 vided with a corrugation or bead having pan inwardly turned edge which isadapted to be forced into intimate contact with thestaves,

to prevent accidental displacement of said hoon on the package.

tures shown and described inthe following drawings. specifications and claims,

In the drawings 1- Fig. 1, is a side view, partlally in section, of

sectionand'as it appears before being driven intoplace on said tuba Fig.- 3 isaview simila'rto Fig. 2, showing myimproved hoopdri v en into: place on the modified driving member shown'in Fig. 5,

by which the crimped vedgeof my improved 1 hoop is escalloped as 'shown' in Fig. 6. I

Figs/T and 8, show'a modified; form of cor rugations as applied to my invention;

In all the views, numeral 9 indicates'a wooden package or tub used for shipping and storing butter, lard and similar commodities. This tub is. made up ofav number of tapered staves placed edge to edge and bound toposition thereon the gether byhoops 10'ofan improved construc- I tion, which I claim as my invention.

The metalhoops now generally used on butter tubs are made of fiat metal strips with a bead formedon oneedge thereof; This bead I is circular in cross section and practically closed, and as thesharp edge OftllG hoop is rolled over onto the hoop itself to form this bead, this sharp edge cannot be utilized for the purpose hereinafter described. Also, in lappingthe ends'ofthisbeadedhoop, an unsightly and awkward jointresults, due to the doubled-up beads at this point,'w'hich tend to skew the ends of the hoop out of alinement during the riveting operation. And further, the operation offorming thisclosedbead and the mechanism required thereforis more dif. ficult and complicated than theroperation and mechanism required to form the'open bead, or corrugation, employed in my improved hoop. 1 I I I The hooplO is flared to fit the tapered surface of the tub9, and the 'forward flared edge 11 is turned slightly outwardly to prevent. his sharp edge cuttinginto the staves during y I -=rtl1e driving operation. 45 Myinvention consists, further, ofthe fea- The other, or rear, edge of the hoop 10 is provided .w itha circumferential corrugation 12 ha'ving its edge 13 turned inwardly into contact withthesurface of the tub as shown in Fig. 2,2 andxat an anglethereto as shown. I A hoopdriving machine (not shown) is employed to; force the. hoops onto the tab with considerable pressure, and this machine carries expanding hoop driving rings composed of segments 14 having a shoulder 15 to engage the edge 13 of the hoop. Now, when the hoops 10 are driven to a point where the tub is tight, further progress of the hoop is checked, and continued movement of the segments 14. will force the edge 13 into the position shown. in Fig. 3, with said edge crimped into the surface of the tub to secure the hoop thereon against accidental displacement. I prefer to provide a wide, shallow corrugation 16 near the center of the hoop to improve theappearance thereof and also to provide a recess to accommodate the heads of the rivets 17 at the joint. This'shallow corrugation also has a tendency to make the hoop more elastic so that it would be more likely-to stretch under abnormal stress. It will be understood that it is rather difiicult to make a flared hoopout of a strip of flat material. In order to do this and to maintain the strip in substantially one plane, it is necessary that the metal be stretched adjacent one edge of the strip to give the frusto-conical shape. By forming the plurality of corrugations in the strips, such as the deep corrugation 13 and the shallower corrugation 16, a flared or frusto-conical shape is given to the hoop. Itwill benoted that the circumferential lines at the innermost parts of the hoop lie in a conical surface, while the outermost lines at the outer side of the hoop lie substantially in a cylindrical surface or in a line which. is parallelto the longitudinal axis of the tub or container.

I11 Figs. 4, 5 and 6, I have shown how the edge 13 of the hoop 10 may be. escalloped'or formed with transverse corrugations or teeth by the serrated edge 18 of the hoop driving segments 19. This escallopededge will serve to increase the crimping effect, due to the number of small points or teeth 20 entering the surface of the tub.

Figs. 7 and 8 illustrate how the hoop may be provided with a number of smaller corrugations or teeth 21, which may be desirable on certain styles of packages.

From the foregoing description, it is evident that my improved hoop has several novel and meritorious features, including: the open head or corrugation 12' which 'is easier to make, makes a better lapped joint and which provides a crimping edge13; and also the corrugation 16 which forms a recess for the rivet heads and which improves the appearance of the hoop and makes it more elastic.

What is claimed is 1 1. A metal hoop for a tapered container, having a frusto-conical form, having its edge at its smaller end1 turnedinwardly to bite into the material of said container and having awide shallow circumferentially extending -corrugation disposed intermediate its edges with itsconcave side directed inwardly and having itsedgeat its larger end turned slightly outwardly,-'said hoop engaging said" container only along circumferential lines at the sides of said corrugation and at said inturned edge.

2. A metal hoop for a tapered container having a frusto-conical form'and having its edge at its larger end turned outwardly and its other edge turned inwardly into contact with thecontainer, and provided with a comparatively deep circumferentially extending outwardly curved bead at said latter edge and a comparatively wide and shallow corrugation between said first mentioned edge and said bead, whereby inner lines of said hoop lie in a conical surface.

3. A metal hoop for a tapered container having a plurality of circumferentially extending corrugations, one of said corrugations being adjacent one edge of said hoop and having its concave side directed inwardly, the free edge of said corrugation being bent inwardly and toward the opposite edge of said hoopinto the material of said container.

4. The structure set forth in claim 3, said free edge of said corrugation being further provided with a plurality of transverse corrugations or teeth adapted to bite into the material of said container.

5. A metal hoop for a tapered container, having a frusto-conical form and having its edge at its smaller end provided with a circumferentally extending comparatively deep corrugation with the concave side thereof directed inwardly, the free edge of said corrugation being bent inwardly to, bite into the material of said container, said hoop also having a wider comparatively'shallow circumferentially extending corrugation with its concave side directed inwardly adjacent said corrugation, said hoop engaging said container along the line between said corrugations.

6. A closed metal hoop for a tapered container having a frusto-conical form and having its edge at its larger end turned slightly outwardly and its edge at its smaller end turned inwardly to bite into the material of said container, a plurality of circumferentially extending grooves between said edges, said grooves haying their concave sides directed inwardly 7. A hoop for a tapered body having a plurality of circumferentially extending corrugations therein of different sizes, the inner most lines ofsaid corrugations lying in a conical surface and the outermost'lines of said corrugations lying in a cylindrical surface having its axis substantially co-incident with the longitudinal axis of said container where-. by a hoop of'frusto-c-onical shape is formed.

8. A metal hoop for a frusto-conical container comprising a stripof material having a plurality of corrugations extending longitudinally thereof, said corrugations, respectively, varying in depth from one edgeof said hoop toward the other, the innermost lingg of said corrugations at the inner side of said hoop being disposed in a conical surface and engaging said container, whereby a frustoconical hoop is formed.

9. A hoop for an upwardly flaring container comprising a ring of sheet metal having its edge at its upper side curved outwardly on a comparatively small radius, said hoop having a bead at its other edge formed on a small radius compared to the width of said ring, said ring curving outwardly between said outwardly curved edge and bead and enaging the container along narrow zones ad- ]acent said outwardly curved edge and bead.

In testimony whereof I aflix my signature.

AXEL M. WALSTROM. 

